Roofing discussion!!!

[ovrszd]

Yeah DigginIt, you missed the mark with that comparison.

Let's say your $5K car needs a new engine. You purchase an engine. You install it with the old serpentine belt because a new one costs $20. Instead of buying new oil and filter, you just use the old oil and filter from your dead engine. Same with Air Filter and Spark Plugs. Rather than install new exhaust gaskets, just bolt it together without them. And Antifreeze, it's highly overrated, just use water.

After all not everybody is made of money and can afford to not be frugal. Some of us live in the real world.

 

[4570Man]

I don’t know why you’d tar paper over the shingles at all. Strip out the roof with 1 or 2x4s and put the metal over that.

 

[4570Man]

^^^ That's the way you turn a $5,000.00 job into a $20,000.00 job.

Maybe from 5k to $7500 and it’s no doubt the best way. It definitely wouldn’t be a 4x increase. But you can pretty quickly identify major rotten places by walking on the roof or looking on the bottom so it’s probably not a worthwhile expense.

 

[Gregster613]

I'm not a roofer at all, but was recently talking to a roofer about some issues with my roof and asked him about how he goes about fixing leaks if I would have him shingle over top of my current shingles (ie..double shingle layer) and asked how does the paper stay flat? He said they don't use another layer of paper, that it's just a water barrier and the current paper/shingles on the roof act as the barrier now. IE..just place a fresh layer of shingles on and it's "supposedly" good to go. I decided not to shingle over but have the entire thing redone, but that's the answer I got.
Nothing to do with the OP question of tin over shingles I know, but thought I'd tell what the roofer told me when I asked something similar.

 

[3gunr]

A good roofing crew can strip a roof in 4 or 5 hrs i doubt it would cost that much more . the dumpster and disposal being part of that cost.

 

[Steppenwolfe]

^^^ That's the way you turn a $5,000.00 job into a $20,000.00 job.

Nah... It's called doing it right. Cheap is always cheap, and can never be made right. I'll call Eddie as my first witness...

 

[stingray1]

I don稚 know why you壇 tar paper over the shingles at all. Strip out the roof with 1 or 2x4s and put the metal over that.

The tar paper is a buffer,it is supposed to keep the shingles from rubbing a hole in the tin. The better way is do as you suggest and the right way would be to remove the shingles.

 

[TnAndy]

One reason for stripping a roof with 1x or 2x is to give the screws something to actually hold onto. You run the typical 1.5" screw into a shingle and then into an OSB decking and you ain't got much holding power.

I've seen a LOT of metal roof where they installed them over 1/2"- 7/16" OSB (which ought to never get on a roof to begin with IMHO) and after a few years, there are a lot of screws sticking up 1/4-1/2" or more because they simply wouldn't hold in that crap.

 

[MossRoad]

I guess the thing to do would be to look up metal roofing manufacturers and see what they recommend on how to install it. From what I've seen over the years, I'd be surprised to see any that recommend them laid flat on existing shingles with tar paper over them. Pretty sure they all recommend air gap so any condensation can run out and air can circulate.

 

[TnAndy]

^^^ That's the way you turn a $5,000.00 job into a $20,000.00 job.

Or one could simply have aluminized, or rubberized, paint sprayed on the existing shingles for $1500....2 coats for $2200 "while we're here"...

That work for ya ?

Neighbor of mine does lot of fairly crappy work on his place/machinery, and it always saying " A poor man has poor ways" as justification for not spending what it takes to do it right. One day I looked at him re-doing something for the 3rd or 4th time and said "Did it ever occur to you that it might just be the reverse....that poor ways CAUSES your poorness, having spent MORE money to fix it several times ?"